1 files changed, 36 insertions, 0 deletions
diff --git a/modules/flakes.nix b/modules/flakes.nix
new file mode 100644
index 0000000..df86369
--- /dev/null
+++ b/modules/flakes.nix
@@ -0,0 +1,36 @@
+{ config, pkgs, unstable, unstable-small, nixpkgs-2111, lib, ... }:
+
+with lib;
+let
+  base = "/etc/nixpkgs/channels";
+  nixpkgsPath = "${base}/nixpkgs";
+  nixpkgsSmallPath = "${base}/nixpkgsSmall";
+  nixpkgs2111Path = "${base}/nixpkgs2111";
+in
+{
+  options.nix.flakes.enable = mkEnableOption "nix flakes";
+
+  config = lib.mkIf config.nix.flakes.enable {
+    nix = {
+      package = pkgs.nixUnstable;
+      experimentalFeatures = "nix-command flakes";
+
+      registry.nixpkgs.flake = unstable;
+      registry.nixpkgsSmall.flake = unstable-small;
+      registry.nixpkgs2111.flake = nixpkgs-2111;
+
+      nixPath = [
+        "nixpkgs=${nixpkgsPath}"
+        "nixpkgsSmall=${nixpkgsSmallPath}"
+        "nixpkgs2111=${nixpkgs2111Path}"
+        "/nix/var/nix/profiles/per-user/root/channels"
+      ];
+    };
+
+    systemd.tmpfiles.rules = [
+      "L+ ${nixpkgsPath}         - - - - ${unstable}"
+      "L+ ${nixpkgsSmallPath} - - - - ${unstable-small}"
+      "L+ ${nixpkgs2111Path} - - - - ${nixpkgs-2111}"
+    ];
+  };
+}